Assumption 6 
(Restriction to fast-slow ODEs) The ODE (REF ) satisfies the geometric definition of a \(C^r-\) smooth singularly perturbed ODE in e.g. [1]}, [2]}, i.e. the level set
\(C_{ode} := \left\lbrace  z \in \mathbb {R}^n : N(z) f(z) = O_n \right\rbrace \) 
